d5c0eaef1f
Until now, when BR2_CCACHE=y, ccache support was built into the
toolchain wrapper, and used regardless of whether the toolchain is
using during the Buildroot build itself, or later as part of the SDK.
However, having ccache support forcefully enabled in the SDK can
really be surprising, and is certainly unexpected for a
cross-compilation toolchain. This can be particularly surprising as
the ccache cache directory may be hardcoded in the ccache binary to
point to a folder that does not make sense on the SDK user's machine.
So what this commit does is create a BR2_USE_CCACHE variable, which
when set to 1 tells the toolchain wrapper to use ccache. Not defining
the variable, or specifying any other value that 1 causes the
toolchain wrapper to not use ccache. The main Buildroot Makefile is
modified to export BR2_USE_CCACHE = 1 when ccache support is enabled,
so that ccache is used during the Buildroot build.
However, when someone will use the SDK outside of Buildroot, the
toolchain wrapper will not use ccache.
The BR2_USE_CCACHE variable is only conditionally enabled in the main
Makefile (via ?=) so that it can be overridden in the environment if
one wants to quickly test disabling ccache in a ccache-enabled
Buildroot configuration. This is the scenario that was considered in
commit
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|---|---|---|
| arch | ||
| board | ||
| boot | ||
| configs | ||
| docs | ||
| fs | ||
| linux | ||
| package | ||
| support | ||
| system | ||
| toolchain | ||
| utils | ||
| .clang-format | ||
| .defconfig | ||
| .flake8 | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .shellcheckrc | ||
| CHANGES | ||
| Config.in | ||
| Config.in.legacy | ||
| COPYING | ||
| DEVELOPERS | ||
| Makefile | ||
| Makefile.legacy | ||
| README | ||
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches